1092e2f0f8
Was wave-1: CDN importmap, "schematic ring" NEOs, 13 gates. Now: vendored offline Three.js, real NEO orbits, 22 gates, Epoch (deep-time) toggle, Sky-events layer + event band, textured/tidally-locked/colourised moons, decade-century rates. Updated intro, verify table, layer table, controls, architecture, credits. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
112 lines
6.6 KiB
Markdown
112 lines
6.6 KiB
Markdown
# SOLARGOD ▸ Orrery
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A standalone, browser-based 3D solar-system explorer — the interplanetary sibling
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of [GODSIGH](../GODSIGH), which watches Earth. Float above a compressed-scale
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("MEGA") solar system with every world visible at once, moving on **real JPL
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ephemerides**; scrub a time bar across **six thousand years**; fly the camera into
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orbit around any planet, its moons circling, textured and tidally locked; toggle
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**TRUE scale** and watch the system animate out into its real, humbling emptiness.
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Live layers plot where Voyager 1, JWST and Parker Solar Probe are *right now*, real
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main-belt asteroids, comets, and near-Earth close-approaches on their **true
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orbits** — and a computed almanac of oppositions and elongations on the time bar.
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Everything is client-side, free, keyless, and runs **fully offline**.
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## Quickstart
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```sh
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python3 serve.py # stdlib only — no npm, no build step
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# open http://127.0.0.1:8147
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```
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`serve.py` statically serves the app and proxies the JPL feeds a browser can't call
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directly (Horizons / SBDB / CAD — no CORS), with a disk cache in `cache/`. Three.js
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is **vendored** under `vendor/three/`, so the app runs with no CDN. The
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deterministic core (Sun, planets, moons, orbits, sky events, time travel) runs with
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**zero network calls** — positions are computed locally from Keplerian elements;
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network layers (spacecraft, asteroids, comets, close-approaches) are additive and
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fail soft.
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## Verify
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Open **http://127.0.0.1:8147/verify.html** — an in-browser gate runner that checks
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the ephemeris against **JPL Horizons ground truth** (hard-coded checkpoints + live
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queries through the proxy). All **22 gates** should read PASS, e.g.:
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| Gate | Result |
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|------|--------|
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| Mars / Jupiter / Earth @ 2026-07-15 (heliocentric ecliptic AU) | Δ ≤ 3.3e-4 / 2.9e-3 / 3.9e-5 AU |
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| Kepler @ e=0.97 · orbitPath closes · frame round-trips · MEGA→TRUE keeps direction | exact |
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| Mars @ J2000 · Jupiter @ 1900 vs **live** Horizons | Δ 4.8e-5 / 2.0e-3 AU |
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| Main belt between Mars & Jupiter · Halley aphelion beyond Neptune | pass |
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| Voyager 1 @ 2026-07-15 = (−32.07, −136.21, +98.55) AU · JWST hugs Earth | Δ 0.002 / 0.011 AU |
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| **NEO** propagated miss vs CAD (real orbit) | ≤ 25% (median ~0.6%) |
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| **Sky events** — Mars opposition ±2 d of 2027-02-19 · Venus elongation cadence · nextEvent | pass |
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| **Deep time** — Jupiter @ 1000 BC · Mercury @ 2500 vs live Horizons (Table 2a/2b) | Δ 0.004 / 3.3e-5 AU |
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| **Event band** maps the ±2 yr window to full width | pass |
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## Layers
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| Layer | Source | Default | Notes |
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|-------|--------|:------:|-------|
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| **Planets & orbits** | JPL SSD approximate elements (Standish) | on | 8 planets + Pluto, textured, MEGA-compressed orbit paths |
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| **Body labels** | — | on | names; the focused body's children also get distance labels |
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| **Moons** | NASA/USGS mosaics | on | 21 moons, per-parent compression, retrograde Triton; 8 with real surfaces, **tidally locked**; grayscale mosaics directorially tinted (Titan orange, Europa tan…) |
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| **Rings** | true km, scaled to parent | on | Saturn (textured annulus) · Uranus (schematic) |
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| **Spacecraft** | JPL **Horizons** (proxy) | on | Voyager 1/2, New Horizons, JWST, Parker, Juno, Lucy, Psyche — live distance + one-way light-time |
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| **Main belt** | JPL **SBDB** (proxy) | off | ~1500 main-belt asteroids, shared Kepler core |
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| **Comets** | JPL **SBDB** (proxy) | on | 1P/Halley, 2P/Encke, 67P, 96P — full orbits + anti-sunward 1/r² tail |
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| **Close approaches** | JPL **CAD + SBDB** (proxy) | off | ±30-day NEOs at their **true propagated positions** with real orbits (per-object fail-soft to a schematic ring); miss distance in lunar distances |
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| **Sky events** | computed (no network) | on | oppositions, conjunctions & greatest elongations as diamonds on the timeline's **event band**; click one to jump the clock |
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## Controls
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- **Focus** — click any body (or use the Focus menu) → the camera flies into orbit
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around it; breadcrumb `SOL ▸ JUPITER ▸ EUROPA`; `Esc` steps out one level.
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- **MEGA / TRUE** — toggle the scale mode; the transition animates over ~2.5 s.
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- **Epoch** — `1800–2050` / `3000 BC – 3000 AD`: switch to the extended
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Table 2a/2b range (reloads the session, carried in the hash as `&e=1`).
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- **Body scale** — 1× / 100× / 1200× radius exaggeration.
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- **Time bar** — NOW, play/pause, reverse, rate presets (`1× · 1 min/s … 1 yr/s`,
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plus `1 decade/s · 1 century/s` for deep time), a scrubbable timeline, and an
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**event band** below it mapping the computed ±2 yr window to full width (a bracket
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on the main strip marks its extent). A **LIVE / SCRUBBED** chip mirrors GODSIGH.
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- **Info panel** — appears on focus: a grimoire card with a physical fact sheet,
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hand-written prose, a stylized portrait, and **live computed** facts (distance
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from Sun & Earth, sunlight age, orbital speed, day & year length, and the next
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opposition/elongation). Focusing Earth reveals a link to the GODSIGH world view.
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- **Shareable URLs** — the view serializes to the hash
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(`#f=<body>&t=<time>&s=<mega|true>&L=<layers>&cam=…&e=<0|1>`); paste one to reproduce a view.
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- **`?debug=1`** — frame-rate / scale readout.
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## Architecture
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No build step, no framework, plain ES modules; Three.js vendored offline. One
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module owns the truth→view transform (`scale.js`); every position is computed in
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real heliocentric J2000 ecliptic AU first (`ephem.js`) then compressed. A
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**floating origin** subtracts the focused body's position in float64 before writing
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to the scene graph, so a focused planet never jitters at close zoom.
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```
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index.html · serve.py · verify.html
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css/style.css · vendor/three/ (vendored, MIT)
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js/ config lib ephem bodies scale ui main
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js/layers/ planets moons rings spacecraft asteroids comets neos events almanac
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assets/textures/ (CC BY + NASA/USGS public domain) · assets/art/grimoire/ (generated)
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```
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The full execution spec is [SOLARGOD_BRIEF.md](SOLARGOD_BRIEF.md); wave-2 polish is
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[PERIHELION_BRIEF.md](PERIHELION_BRIEF.md).
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## Credits
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- **Positions** — [JPL SSD](https://ssd.jpl.nasa.gov/planets/approx_pos.html)
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approximate elements; live feeds via **JPL Horizons / SBDB / CAD**.
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- **Planet/Sun/ring/sky textures** — [Solar System Scope](https://www.solarsystemscope.com/textures/), CC BY 4.0.
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- **Moon surfaces** — NASA/USGS Astrogeology mosaics (public domain); grayscale ones
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directorially colour-tinted. See `assets/textures/CREDITS.md`.
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- **Grimoire art** — generated locally with MODELBEAST / FLUX (see
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`assets/art/PROMPTS.md`); the *aesthetic* layer only — real worlds get real data.
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- Built on [Three.js](https://threejs.org/) (r170, vendored, MIT).
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